Fig. 3
US visualization of fascial spaces (white arrows) around thyroid after hydrodissection. (A) The schematic diagram of hydrodissected anterior cervical space (blue area). The US visualization of anterior cervical space (white arrows) after hydrodissection, which showed an irregularly anechoic area. (B) The schematic diagram of hydrodissected pretracheal space (blue area). The US visualization of pretracheal space (white arrows) after hydrodissection, which showed a semicircular arc area between the trachea and the lateral lobe of thyroid. (C) The schematic diagram of hydrodissected pretracheal space (blue area). The US visualization of pretracheal space (white arrows) after hydrodissection, which showed an anechoic narrow band between the trachea and the isthmus of thyroid. (D) The schematic diagram of hydrodissected retropharyngeal space (blue area). The US visualization of retropharyngeal space (white arrows) after hydrodissection, which showed an irregularly anechoic band. The lateral side of retropharyngeal space is the alar fascia (white arrowhead). THY = thyroid; ESO = esophagus; TRA = trachea; CCA = common carotid artery; IJV = internal jugular vein; T = tumor; US = ultrasound.
